What is the leap in February this year?

There are two February in the lunar calendar year, and the second February is a leap February.

Leaping in February is to prevent the lunar calendar from being out of touch with the tropic year, that is, the four seasons. Because the next month after February of the lunar calendar has only solar terms, Grain Rain after Qingming will be postponed to next month, so there will be a month without neutral atmosphere after February, so the month without neutral atmosphere after February is named "leap February". This is because the appearance of the sun and the moon is not caused by the whole number of days for the earth's rotation cycle.

In order to synchronize the lunar calendar with the solar calendar in seasons, our ancestors adopted the method of "adding leap months" to "adjust the surplus and deficiency" and set seven leap months in 19, because the total number of days in the tropical year of 19 is basically equal to 19 plus seven leap months in the normal year. Therefore, the lunar calendar stipulates a leap month every two or three years. In the year with leap month, the lunar calendar is 13 months, accounting for 383.8978 days.